Configure MergeObjs supports response files rather than Ld
The previous configuration script to test whether Ld supported response files was
- Incorrect (see #23542 (closed))
- Used, in practice, to check if the merge objects tool supported response files.
This commit modifies the macro to run the merge objects tool (rather than Ld), using a response file, and checking the result with $NM
Fixes #23542 (closed)